Carrying scraper



Dec 1, 1942.

. H I J. J.- Low CARRYING SCRAPER Filed March 15,1941

3 Sheets-Sheet 1 INVENTOR. (fol/Nd. 40W

DecQl, 1942. J. J, Low 2,303, 5

CARRYING SCRAPER Filed M -Oh 15, 1941' J a Sheets-sheaf 2f INVENTORQJ wan 4 40w i 1 Dec. 1, 1942.

J. J. LO W l CARRYING SCRAPER' Filed March 15; 1941 s Sheets-Sheet 3 TOR I as sticky adobe, clay,

Patented Dec. 1, 1942 John J. Low,

" Kay-Brunner tion of Delaware Los Angeles, Calif., assignor to Steel Products,

Inc., a corpora- Application March 15, 1941, Serial No. 383,625 6 Claims. ((137-126) My invention relates to carrying scrapers of the character disclosed in my co-pending application Ser. No. 254,021, filed February 1, 1939, since issued as Patent No. 2,239,967, wherein is embodied a bowl, an apron on the front of the bowl, an ejector for ejecting earth from the bowl, and a mechanism operatively connecting the ejector to the apron by which actuation of the ejector is effected in such manner that its movement from a retracted position at the rear of the bowl to an advanced position at the front of the bowl to eject earth from the latter, is initiated only after the apron has reached such an open position that it does not obstruct or interfere with discharge of earth from the bowl by the ejector.

When using a mechanism as embodied in myaforesaid application, it has been found that when dealing with earth that is sufliciently free flowing to partially gravitate from the bowl and completely gravitate from the apron when the latter is in open position, the degree to which the apron is opened before advance movement of the ejector is initiated, is sufficient to allow the earth in the apron to gravitate therefrom in quantity adequate to permit the remaining earth in the bowl to be ejected therefrom by advance movement of the ejector. However, whendealing with earth which is not free flowing such tor can be advanced the apron must be opened to a still wider position in order to cause gravitation of earth from the apron before advance movement of the ejector is initiated, otherwise, the ejector in its advance movement will be so resisted by the earth retained in the apron as to either prevent such advance movement, or break the parts of the mechanism connecting the ejector with the apron.

It isa purpose of my invention to provide a carrying scraper embodying a mechanism by which advance movement of the "ejector in the bowl is delayed until the apron reaches an open position in which earth that is not free flowing can gravitate from the apron, thereby allowing advance movement of the ejector to completely clear the bowl of earth, and without imposing any breaking strains on the mechanism.

In the accompanying drawings:

Fig. 1 is a vertical longitudinal sectional view takenon the line l-l of Fig. 3, showing one form of carrying scraper embodying my invention, and wherein the apron is in closed position and the ejector in retracted position.

Fig. 2 is a view similarto Fig. 1 showing the or the like, before the ejec-- apron in fully open position and the ejector in completely advanced position in the bowl.

Fig. 3 is a view showing the carrying scraper in top plan and with the apron closed and the ejector retracted.

Similar reference characters refer to similar parts in each of theseveral views,

Referring specifically'to the drawings, the carrying scraper comprises a frame A having side members l5, IS, a front end member l6, and a rear end member H, The front member 13 is relatively wide to provide a platform, and projecting forwardly therefrom is an extension l8 .from which depends a standard") connected to a swivel wheel truck 20 having a draw bar 2| adapted for connection to a tractor.

A' rear wheel truck 23 including a rear axle 24 is pivotally connected to the rear of the frame A through a pair of links 25 pivoted on the axle 24 and on a shaft 26 carried by ears 21a fixed to a cross beam 21. A. hydraulic ram 28 is pivoted as at 29 in the rear frame member I! with the piston rod 30 thereof pivotally connected to a pin 3| carried by ears 32 of the links 25.

Manifestly, the mounting of the ram 28 and its operative connection with the links 25 is such that through operation thereof the links can be actuated to elevate and lower theframe A to effect a corresponding movement of a bowl B carj is to coactwith the blade 35 in filling the bowl with earth under forward movement of the scraper, and to confine the earth withinthe bowl once the latter'is filled so that such earth may be transported by the scraper and subsequently discharged. The -apron D includes a wall 36 .curved in the manner illustrated'in Fig. 1; and

projecting forwardly from this wall are a pair of fianges\31 connected '.by a cross beam 38. These flanges 31 extendupwardy above the frame A-where they have fixed thereto a pair of arms 39 which extend rearwardly and have their rear ends pivoted on the frame A at the points indicated at 40.

For lifting the apron D from the closed posi- 2 tion shown in Fig. 1 to the fully open position shown in Fig. 2, or to any desired intermediate position, a pair of parallel links 4| are pivoted to the bowl, as at 42, and to the rear end of parallel bell crank levers 43, as at 44. The levers 43 are fulcrumed, as at 45, on a pair of upstanding ears 46 fixed to the frame member l6. Pivotally connected to the levers 43, as at 41, is the piston rod 48 of a hydraulic ram 49, such ram being pivotally supported upon ears 5!! rising from the extension l8.

For discharging earth from the bowl an ejector E is provided and mounted in the bowl B to occupy a retracted position at the top of the bowl, as in Fig. 1, or an advanced position at the bottom of'the bowl, as in Fig. 2, whereby during downward and forward movement of the ejector from the retracted to the advanced position it operates to sweep earth from the bowl. This ejector includes a pair of side arms 5! bridged by a partition 52 and reinforced by a cross beam 58. The arms 5| are pivotally mounted on the inner side walls 33 of the bowl, as at 54, such pivots being located substantially at the center of ourvature of the rear and bottom, wall84 of the bowl. The ejector E is adapted to be actuated to swing forwardly through the bowl, by elevation of the apron D and through the provision of a mechanism which comprises two sets of elements situated at opposite sides and above the bowl B. As the two sets of elements are identical in construction, a description of one will sufiice for both.

' A bearing standard-55 rises from the frame member l5, and is reinforced by a fixed brace bar 58. At the upper end of the standard 85 is a pin 51 which constitutes a fulcrum for a pair of parallel rocker arms 58. To the forward end of these arms 58 is pivotally connected, as at 58, a link 60, the forward end of such liiikbeing pivoted, as at 6!, to the upper end of the corresponding flange 31. The rear end of the rocker arms 58 are pivoted, as at 82, to the upper end of a link 63, and the lower end of this link 88 is pivoted, as at 54, to ears 85 fixed to the corresponding side arm 5!.

The operation of the ejector E and the apron D through the aforedescribed mechanismis as follows. With the apron in closed position, as shown in Fig. 1, the ejector occupies a retracted position at the top of the bowl, while the two sets of links 80 and 63, and the rocker ams 58 are in the solid line positions. Through operation of the ram 49 to move the piston rod 48 rearwardly, the bell crank lever 43 is actuated and the links 4| elevated to lift the apron D to any open position required. Because of the location of the apron'pivots 40 in relation to the link pivots 59 the apron,

in the first part of its opening movement, moves the links 60 rearwardly to rock the arms 58 so that the ejector E is slightly elevated to the dash line position shown in Fig. 1.

vSuch retrograde movement of the ejector, rocker arms and links, is merely incidental to the links 60 swinging upwardly aboutthe pivots 59 as a center to the dash line position shown, and during which the pivots 5| describe the path defined by the curved line movement of the arms 58 the path described by the pivots 6i would be defined by the line'Y, the arc of which is such that it intersects the lihe X at the point Z. It is'at this point Z that the pivots 59 return to their initial positions to restore the ejector to starting position. L

Manifestly, the aforedescribed upward swinging movement of the links 50 is ineffective to adearth thus discharged from Vance the ejector downwardly through the bowl.

Thus, assuming that the bowl and apron have.

been previously loaded with earth in the usual manner, the ejector is yet to be actuated to discharge earth from the bowl. However, with the upper ends of the lines in Fig. 2. This open position is sufiicient to allow earth that is not free flowing such as wet adobe, clay, or the like, to partially gravitate from both the bowl and the apron, and the quantity of the apron is such that the earth in the bowl is unobstructed by the earth in the apron so that the ejector can now be advanced to discharge the earth from the bowl. By further opening of line position shown in Fig. 2 and to the maximum position in solid lines, the links ill exert an upward pull on the forward ends of the arms 58 to lower the rear ends of the latter, and through the links 83 the ejector is now sprung downwardly and forwardly through the bowl. I I

Manifestly, from the foregoing operation of my actuating mechanism for the ejector, advance movement of the ejector through the bowl is delayed in relation to opening-movement of the apron to such an extent that, even with-earth that is not free flowing, a sufficient amount thereof will be'caused to gravitate from the apron that when advance movement of the ejector is initiated, the mass of earth in the bowl will not be resisted by the earth in the apron as it is discharged from-the bowl under the action of the ejector.

Although I have herein shown and described only one form of carrying scraper embodying my invention, it is to be understood that various changes and modifications may be made therein without departing from the spirit of my invention and the spirit and scope of the appended claims. I claim. c

1. In a carrying scraper; a bowl; arms pivoted on the bowl; an earth ejector carried by said X. Were there no incidental arms tosvaing forwardly through the bowl; an apron pivoted on the bowl; rocker arms fulcrumed on the bowl; links connected to said apron and to the rocker arms at one side of the fulcrum points of the latter; other links connecting the rocker arms atthe other sideof the fulcrum points of the latter to said arms between the pivots of the latter and saidejector; and means for moving the apron, whereby the links and rocker arms coact to actuate the ejector.

2. In a carrying scraper; a bowl; arms pivoted on the bowl; an earth ejector carried by said arms to swing forwardly through the bowl; an apron pivoted on the bowl; rocker arms fulcrumed on the bowl; links pivoted-to said arms at points rearwardlyoi the arm pivots and to said rocker arms rearwardly of its fulcrums; other links pivoted to said apron forwardly of said rocker arms and pivoted to said rocker arms forwardly of its fulcrums; and ,means for moving the apron, whereby the links and rocker arms coact to actuate the ejector.

3. In a carrying scraper; a bowl; arms .pivoted on the bowl; an earth ejector carried by'said arms to swing forwardly through the bowl; an apron pivoted on the bowl; rocker arms fulcrumed on the bowl; links pivoted to said arms at points rearwardly of the arm pivots and to said rocker arms rearwardly of its fulcrums; other links pivoted to said apron forwardly of said rocker arms and pivoted to said rocker arms forwardly of its fulcrums; and means, for elelinks 60 at the point Z the apron is now in the open position shown in dash the apron beyond the dash,

vating t he apron, whereby said other links are p eratively connecting the aprorf and the ejector first caused to swing upwardly' on said rocker foradvancing or retracting the ejector accordthus swing said ejector forwardly through the another link connected to the apron viorwardly bowl. r

4. A carryin scraper, comprising; a-bowl; an of its fulcrum, thepoingot conneetion'oi' the top of the bowl to or from an advanced position the 'rocke'rapn at the front of the bowl; and a mechanism oper- 6. In a carrying scraper; a bowl; arms pivoted atively' connecting the apron and the ejector for on'the bowl; an earth ejector carried by said advancing or retracting the ejector according as arms to swing forwardly-throughthe bowl:'an*

the apron is open or closed, said mechanism inapron pivoted on the bowl; rocker arms ful-;

eluding at least one set of elements comprising a crurned on the bowl;'1inks pivoted to said arms rocker arm fulcrumed on the bowl, a link conat points rearwardly of the arm pivots and to its fulcrum; mounted forwardly of the'apron; a. link connect- 5. A carrying scraper, comprising; a bowl, an 'ing said lever to the apron; and meansfor operapron at the front of the bowl movable to occupy ating said lever to lift the apron through said open and closed positions; an ejector movable in link, whereby the other links and rocker arms v w coact' to swing,the ejector forwardly through top of the bowl to or from an advanced position the bowl,

at the front of the bowl; and a mechanism op- I 1 7 JOHN J. LOW. 

